Reposting from the [original post](https://boards.na.leagueoflegends.com/en/c/developer-corner/W7HAHXyQ-changes-to-gemstone-redemption-for-hextech-chests) to provide visibility! See below:
We recently introduced the cosmetic only Masterwork chests, but you could still upgrade a gemstone into a Hextech Chest and key. Some players over on Reddit made the suggestion that we replace the Hextech chest you can purchase with a gemstone with a Masterwork chest. We agree, so starting in patch 8.10, if you use a gemstone to unlock a chest, it’ll be a Masterwork chest instead of a Hextech chest.
You can read about how the [loot system works and specific drop rates on our player support page](https://support.riotgames.com/hc/en-us/articles/207884233-Hextech-Crafting-Guide).